ib technology

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Data Sheet

EMPROT_LP.PDF

17 Pages

Last Revised 01/03/09

Micro RWD EM4102 Low Power Version

(with auxiliary data outputs)

The MicroRWD EM4102 (Low Power) version is a complete reader and tag acceptance

solution for 125kHz EM Marin EM4102 (and Microchip MCRF200/123) derived RF

transponders. The solution is entirely housed within a 24-pin DIL package and only needs a

700µH antenna connected and a 5v DC supply to be a fully featured RFID Reader system.

The MicroRWD EM4102 LP version behaves in the same manner as the standard reader

except that it has an active, average current consumption of around 100µ

µ

µ

µA (micro Amps)

with 1 second polling rate. As with other RWD modules, all commands and data response are

via a simple TTL level RS232 interface. The RWD module also has output pins for indicator

LEDs, high-current outputs for driving external loads and a programmable “BEEP” output for

external sounders. In addition, the RWD EM4012 LP version has auxiliary data outputs on

the OP0 / OP1 pins that can be programmed to automatically output the UID (serial number)

as asynchronous 9600 baud serial or Weigand protocol Data High / Data Low signals. All

these features can be configured and turned ON/OFF by setting RWD EEPROM parameters.

The diagram below shows the pin out configuration for the RWD EM4102 LP module.

With the ultra-low-power current consumption and the additional auxiliary data output

features, this one of the most compact and flexible reader systems available.

The EM4102 based transponders provide 64 bits of read-only memory. This memory contains

a header bit sequence and parity bits that are decoded to give 40-bits (5 bytes) of user data.

This 5-byte Unique Identifier (UID) or serial number can be read using the READ TAG

(ASCII “R”, 0x52 Hex) command.

TTL

RS232 I/F

Tx

Rx

CTS

Screen

(if applicable)

700 µΗ Antenna

Micro

RWD

EM LP

Green LED

Red LED

1k

0v GND

+5v DC supply

+5v

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

0v GND

22R nom

Micro RWD EM4102 LP module connections

OP0

OP1

OP3

OP2

Current limiting

resistor

“BEEP” output

Auxiliary (automatic) data outputs:

9600 baud serial - OP0

OR

24/32-bit Weigand protocol

DATA HIGH – OP0

DATA LOW – OP1

Aux out (serial) data can be

redirected from OP0 to Tx, pin 23